As mentioned Ash did have a failure of one of these adjusters on his car. The adjuster broke at the point where the head joined the body. I did some quick sums at the time and due to the angled bush tube (compared to the straight ones on a locost) the camber adjuster see a higher load which could be a contributory factor to the failure. for more info see my previous post -
http://www.haynes.co.uk/forums/showp...9&postcount=32
I would reccomend that unless you plan to use something like 7075 alloy, make a steel set. If you make bush tubes it is also a good idea to make stepped ones that would prevent the adjuster being pulled out in the event of a failure.